CVE-2026-4687
Received Received - Intake
Sandbox Escape in Firefox Telemetry Due to Boundary Error

Publication date: 2026-03-24

Last updated on: 2026-04-13

Assigner: Mozilla Corporation

Description
Sandbox escape due to incorrect boundary conditions in the Telemetry component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
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Meta Information
Published
2026-03-24
Last Modified
2026-04-13
Generated
2026-06-16
AI Q&A
2026-03-24
EPSS Evaluated
2026-06-15
NVD
CVE-2026-4687
EUVD
EUVD-2026-14798
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
mozilla firefox to 149.0 (exc)
mozilla firefox to 115.34.0 (exc)
mozilla firefox From 128.0 (inc) to 140.9.0 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-754 The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.
CWE-120 The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.
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Executive Summary

This vulnerability is a sandbox escape caused by incorrect boundary conditions in the Telemetry component of Firefox. It affects versions of Firefox earlier than 149, Firefox ESR earlier than 115.34, and Firefox ESR earlier than 140.9.

Impact Analysis

Exploitation of this vulnerability could allow an attacker to escape the sandbox environment, potentially leading to unauthorized access to system resources or execution of arbitrary code outside the intended restricted environment.

Compliance Impact

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Detection Guidance

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